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Networking

Table of Content

Networking#

What is a computer network#

A computer network comprises two or more computers that are connected—either by cables (wired) or WiFi (wireless)

Network bazz …#

  • LAN
  • WAN
  • Switch
  • Router
  • Modem
  • ip address
  • gateway
  • DNS
  • DHCP
  • services

LAN / WAN#

Modem / Router / Switch#

  • Convert to

Router#

wikipedia: A router is a networking device that forwards data packets between computer networks.

  • NAT
  • Gateway

Switch#

wikipedia: A switch is a device in a computer network that connects other devices together.

All in one#

Cable#

WIFI#

Network commands#

  • ping
  • ifconfig

Ping#

  • ICMP(8) - The Internet Control Message Protocol (ICMP) is a network layer protocol used by network devices to diagnose network communication issues.

Ping: command uses ICMP to send a packet to a remote host and wait for a response. This can be used to test the connectivity between two hosts and to measure the round-trip time (RTT) of a packet.

ping 8.8.8.8

ifconfig#

ifconfig is a system administration utility in Unix-like operating systems for network interface configuration.

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)

wlo1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.100.102.16  netmask 255.255.255.0  broadcast 10.100.102.255
        inet6 fe80::493f:baf7:5f6a:1d4c  prefixlen 64  scopeid 0x20<link>
        ether f4:4e:e3:a1:cc:c3  txqueuelen 1000  (Ethernet)

Models#

height:400px

DHCP#

DNS#

Service#

Network service is an application called server that has service base on protocols

  • Web
  • Email
  • zoom

Protocol#

Network protocols are a set of rules outlining how connected devices communicate across a network to exchange information.

  • HTTP
  • DHCP
  • DNS